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Ok a while back i installed my upgraded td04, and i had a stock gutted uppipe on there already. When i was loosening one of the rear bolts that hold the turbo to the uppipe, the stud broke right in half. I had no time or way to fix it at the time, so i left that one bolt off there, and was pretty sure it was going to leak too. So, i drive the car, everything is fine until im in like 2nd or 3rd and flooring it, and i hit full boost, the boost guage swings to around 15psi, then back down, then back up again, fluctuating alot. When this happens, i hear a whirring noise, not the normal turbo noise, but like a whining whirring noise, and it also fluctuates with the boost guage needle, louder as the boost goes higher. So, i thought this was a leak, so i bought a uppipe to turbo gasket, and fixed the broken stud by putting a new one in, and made sure everything was perfect. I put it all back together, and during idle and even revving, no sounds, but there were none before either. Then i drive it, noise is still there when i get on it...im starting to think its not a leak, and may be something wrong with this turbo? It is ported and polished, clipped exhaust wheel 10degrees, and a t28 compresser wheel. Help me out, sorry for the long thread

Originally posted by latinskllz 1) Did you have the stock gutted up-pipe installed prior to this upgrade?

2) Do you notice smoke coming out from the exhaust?

3) Did you properly torque the up-pipe down to the exhaust inlet of turbo?

Check for smoke coming out the exhaust....

Kevin

1) Yes, ive had this stock gutted uppipe on the car for at least 5k miles prior to this. It was FULLY gutted, and i bought it off somene, and i checked it thouhrouly for anything inside it, it was clean....

2) Smoke comes out of the exhaust only sometimes, maybe when i floor it people tell me it comes out black, but everyones does that...a while back smoke did come out of the exhaust, a bit of white smoke, but that eventually went away...and this was with my stock turbo anyway.

3) Yes i did torque them properly, and used new gasket BUT i didnt use a new gasket when i did the uppipe originally, but yesterday i put a new one in...

Sounds like its just the stock ECU controlling the boost, and falling off near redline, PSI going up and down is prob because the turbo wants to boost, but the ECU is trying to tame it down... I say buy a boost controller...

Originally posted by WRXtreme02 Sounds like its just the stock ECU controlling the boost, and falling off near redline, PSI going up and down is prob because the turbo wants to boost, but the ECU is trying to tame it down... I say buy a boost controller...

Makes sense if he is running on a stock ECU...what other mods do you have, like a S-AFC etc...?